Attachment plug



Afound applicable.

Patented Aug. 18,

UNITI-:o STATES rPATIENT oF-FlcE.

:Laiton x. nUsTIN, or cxrcaco, ILLINoIs.

.arracnmr rLuo.'

Appunti med imi: is, im. semi No. 524,404.

To -alZ whom it may concern:

Beit known that I, BLANCHE K. DUsTIN, a citizen of the United States,residing at Chi in the county of Cook and State of Dlinois, haveinvented certa-in new and useful Improvements in Attachment Plugs, ofwhichy the following is a description.

My invention relates to improvements in attachment plugs and '.isparticularly intended to'facilitate theinsertion of the attachmentiplugsinto sockets that` are so located that they are not easily reached orhaving long 'narrow shades or globes there- OIL A My invention has amongits other objects 'the production of a device of. the kind dev scribed,which is neat and attractive in appearance, economical of construction,simple, convenient, compact, durable, reliable, etlicient andsatisfactory for use wherever Many other objectsand advantages of theconstruction herelnshown and described will be obvious to those -skilledin the art from the disclosures herein given.

To this end my inventioirfeonsists 'in the novel construction,arrangement and oo mbination of parts herein shown and described,

claims.

In the drawings, wherein like reference characters indicate like orcorresponding 113:- y paFig. 1 is a longitudinal section through mydevice;

Fi 2 is an end view thereof with on memer of the attachment plugremoved;

Fig. 3 is a fr tary section showing the extension han e for use with adifferent thereto.

In case 'the shade 1 is long and narrow, the socket is uite -hard to getat with the ordinary at ent plugs without removing` the shade.

AThe device consists of a handle portion 2, preferably made of somesuitable iiisulating material, the handle 2 having an enlarged socket orchambered portion 3 at one end -and provided with a longitudinal bore ,4centra ly through the handle and communicating with the enlarged chamberor socket 3. The handle itself is made of a shape to be easily graspedand manipulated, and 1n the form shown is tapered down rearwardly ofboth its ends, and the same may be corded Hor roughened if desired.

The socket portion 3 is internally threaded as at 5 to permit theinsertionl of `one member 6 of an attachment plug.6-.8 thereinto, saidattachment member as shown being externally screw-threaded to cooperatewith the internal threads 5 of the handle. In order to minimize the wearbetween the engaging portions of the contact members of the parts of theattachment plug and also to prevent independent rotation between theplug parts and the handle while inserting the plug into or removing itfrom the socket,

the interengaging parts of the plug and handle are formed withcooperating inter` engaging corrugations, pins, teeth, or the like, themeans shown in Figs. 1 and 2 coinprising corrugations 11 formed at theend of the handle and adapted to interengage with cooperatingcorrugations and recesses 12 formed on one end of the plug portion 8.Corrugations 11 are formed on the part 6 adjacent the corrugations 11 ofthe handle so as to be continuations thereof.

It is apparent that when screwing the plug into place into the socket,the plug parts will not rotate independently of one another while thehandle is pressed thereagainst, but will rotate in unison to firmlyscrew the lug into place. When removing the plug om the socket, thedirection of rotation of the handle is reversed and due to theinterengagement of the corrugations of the parts, the entire plug may berotated in the socket. Obviously the handle and the attached part of theattachment plug may be removed from the other part of the plug by alongitudinal separation of the parts. The bore 4.- permitsthe insertionof an electric cord 7 therethrough, the free ends of said cord beingconnected in the usual manner to the contact terminals of the attachmentart6. A0131 equivalent construction may employ In the form shown inFigs. 1 and 2, the

attachment plug is of the swivel type in .c

which the member 6 ma rotate within the cooperating attachment ug member8, while in the form shown in 3 and 4 the attachment plug is of the moregenerally u'scd type and one member of whlch comprises the part 9 havingthe standard parallel contact prongs 10 or the equivalent.

The corrugations between the handle and the plug parts may be formed asin the previously described modification, or, 1f desired, interlockinglugs or pins may be formed between the engaging parts, as shown indotted lines in Figs. 3 and 4. The pins 14 at the end of the handle 2are circumferentially spaced apart and engage 1n recesses 15 in thecooperating attachment plug member 13. These pins may be either inaddition to or in lieu of the corrugations between the parts. There willbe no strain upon the contact prongs' 10 while the plug is being screweddown into the socket or removed therefrom, because 'all of therotational mo-vment between the parts will be taken up by theinterengaging pins and recesses, or the corrugations, as the case maybe, taking all strain oil the prongs 10.

I-t is to be additionally noted that there will be no loosening of theends of the cord 7 at the contact members because the interlocking ofthe handle and plug prevents any twisting of the prongs 10.

From the foi-,going description, it is obvious rthat the attachment plugof any type may kbe screwed into a lamp-socket by axiallyf rotating theextension-handle 2 carrying the plug, seat the plug in place. The handle2 also serves to minimize the wear u on the cord 7 by p-reventingengagement w1th the edges of the shade', these edges being sometimesquite sharp.

I-Iavingthus described my invention, it is obvious that variousimmaterial modifica- Y tions may be made in the same without demember ofan attachment plug at one end,

and interenga `ng projections and recesses formed on sai handle and theother member of the attachment plug independently of its contactterminals to detachably interlock parts to rotate in unison.

2. A device of the kind described comprising a ri 'd extension ha'ndleof insulatlng materia bored longitudinally to receive an electric cordtherethrough, one end of said bore being enlarged to permit theinsertion of one member of separable attachment plug thereinto, theinterengaging surfaces of said plug members having interengagingprojections and recesses therein, and said andle itself havingprojections thereon to interengage with the recesses of the other ofsaid plug members to detachably transmit rotational. movementtherebetween.

3. In an attachment plug for electric light sockets, the combination ofa hollow v threaded terminal member adapted to be screwed into thesocket and a second terminal member telescopically engaged andfrictionally held in Jsaid hollow member with an elongated rigidextension handle of insulating material bored longitudinally to re ceivean electric cord therethrou h, one end of said handle being enlarged anhaving an internally threaded concave hollow portion, said secondterminal member having a laterally extending external threaded flangeadapted to coo rate with the internal threads in said ollow end portionto securely hold the parts in assembled position.

4. An attachment plug for electric light sockets comprising a. air oftelescopically engaged terminal mem rs, one of which is adapted to bescrewed into the light socket and the other of which is rigidly securedtc an elongated handle member of insulating material, said handle memberprovided with projections adapted to cooperate with the recessesarranged in said terminal mem ,r which is screwed into the lamp socket,whereby the contact members are relieved of the torsinal stress when theplug is screwed into a lamp socket.

5. An attachment plug for electric light sockets comprising a palr oftelescopically engaged terminal members, one of which is adapted to bescrewed into the light socket and the other of which is rigidly securedto an elongated handle member of insulating material, said handle memberprovided with projections adapted to cooperate with the recessesarranged in said terminal member which is screwed into the lamp socket,said terminal member and said handle being providedwith cooperatingcorrugations which cause said terminal members when telescoped to formtogether with the handle a rigid structure.

In testimony whereof, I have hereunto signed my name.

y BLANCHE K. DUSTIN.

